Rubbing, sandpapering, and polishing machine.



w. .1. MADDOXI.

RUBBING, SANDPAPER|NG,'AND POLISHING MACHINE.

(Application filed. June 23, 1900.)

3 Sheets-Sheet I.

(No Model.)

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No. 668,533. Patehted Feb. I9, 1901.

.W. J. MADDOX.

RUBBING. SANDPAPERING, AND POLISHING MACHINE.

. (Application filed June 23, 1900.) (No Model.) V 3 Sheets-Sheet 2.

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Patented Feb. l9, I901.

(Application filed June 23, 1 900.)

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NITED STATES PATENT FFICE.

WILLIAM MADDOX, OF JAMESTOWN, NEW YORK.

RUBBING, SANDPAPERING, AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 668,533, dated February 19, 1901.

Application filed June 23, 1900. Serial No- 21,332. (No model.)

T0 on whom it may concern:

Be it known that 1, WILLIAM J. MADDOX, a citizen of the United States,residing at Jamestown, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Rubbing, Sandpapering, and Polishing Machines; and I do hereby declare the'following to be a full, clear, and exact description of the same, reference being had to accompanying drawings, forming a part of this specification, and to the letters of reference marked thereon.

This invention relates to improvements in machines designed for rubbing down, sandpaperin g,or polishing surfaces of wood, metal, or stone, and it is particularly designed as an improvement upon the machine described and illustrated in my prior patent, No. 650,407, dated May 29,1900.

The objects of the invention are to simplify the mechanical construction of the operating parts and to provide a machine which is capable of a wider range of utility than heretofore.

Referring to the accompanying drawings, Figure 1 is a perspective view of a machine embodying my present improvement-s. Fig. 2 is a detail of one of theadjustable bearings for the elevating mechanism. Fig. 3 is a detail of the rocker or driving mechanism. Fig. at is a Vertical section through the rubber and tape for driving the same. Fig. 5 is a section at right angles to Fig. 4. Figs. 6, 7, 8, and 9 are detail views of parts of the rubber.

Like letters of reference in the several figures indicate the same parts.

The frame of the present machine is composed of two end pieces A A,between which are bolted two side pieces B B, the former having bearings O and O for the driving mechanism of the rubber and the latter constituting the supports for the work-carrying mechanism. As in said former machine,the work is adapted to be supported upon a carriage or table D, mounted to travel back and forth at right angles to the line of travel of the rubber on tracks or ways E, the latter being mounted on an elevating mechanism, which will raise said tracks while maintaining their horizontal and parallel positions, the elevating mechanism consisting, essentially, of crank-arms e, journaled in hearings on cross-pieces F and adapted to be turned so as to raise or lower the tracks by means of a shaft G, carrying an operating arm or handle G at one end. This elevating mechanism, it will be observed, has a definite throw by reason of the fixed length of the crank-arms, and in order to give a very much wider and more minute adjustment to the carriage or table I now mount the crosspieces F, in which the bearings for the cranka-rms are formed,on vertically-adj ustable supports, such supports consisting in the preferred form of downwardly-extending screwthreaded shafts H, passing loosely through bearings H on the inner sides of the side frame B, there being four of such shafts and bearings,as is well illustrated in Fig.1. Resting on the bearings H and cooperating with the threads of the shafts are supporting-nuts I, made in the form of sprocket-wheels, and all of the sprocket-wheels are geared together by means of a sprocket-chain 1, whereby when one of them is turned in either direction a corresponding motion is imparted to all and a uniform adjustment of the elevating mechanism secured.-

As a convenient means for turning the nuts one of them may be provided with a radiallyextending handle t, journaled on the nut and carrying a reversible pawl 2', adapted to cooperate with a toothed surface 2' on the nut. Thus the attendant by setting the pawl and grasping the handle may rotate the nuts in either direction at will and so adjust the height of the elevating mechanism to accord with the thickness of the work being operated u on.

At the top the two frames A A are united by a bridge or guide K, constituting a slide for the rubber or rubbers when more than one rubber is employed, and said rubbers are adapted to be connected to a strap or tape L, which at its opposite ends is connected with relatively large but light dru ms L, preferably made of aluminium and mounted on shafts L which shafts also carry pulleys or drums L to which the opposite ends of a second tape M are attached. This second tape M passes down and around the rocker N, Fig. 3, adapted to receive its oscillatory motion from the driving mechanism carried by the shafts O O,

as in the patented machine before referred to. The rocker N in the present instance is formed in two parts or segments separated slightly or having a central recess into which a bight of the tape M may be passed and confined by adjustable take-up devices or setloop's N, which in addition to fastening the intermediate portion of the tape to said rocker provide a ready means for adjusting the tension of the tape M, and by causing a corresponding rotation of the shafts L cause a corresponding tension to be imparted to the tape L. As a convenient construction, the rocker N is formed with radial spokes, to which the peripheral segments may be secured, andthe central spoke is provided with a bifurcated end N for supporting the take-up devices N, as will be readily understood from an inspection of Fig. 3. Both tapes, it will be observed, are single lengths. Thus the rocker may be comparatively narrow and the rubberorrubbers may be attached to the tape L at any convenient or desired point in its length.

The rubber itself is preferably formed as illustrated in Figs. 4 to 9, inclusive, and consists of a body portion P, provided with removable wear-plates p, which cooperate with the slide K, and a clamping-plate Q, adapted to embrace or underlie the tape L and be held in place by swinging bolts Q, journaled at one end on the lower section Q of the clamping-plate and adapted toturn up between lugs P on the body P, where they may be held and the requisite pressure secured for locking the rubber to the tape by means of thumb-nuts Q The clamp-plate Q, and under surface of the bodyP may be corrugated to givea more secure hold on the tape, and by the provision of the bolts and thumb-nuts it is obvious that the rubber may be adjusted longitudinally on the tape to any desired position and any desired number of rubbers may be attached, so as to operate on duplicate work or on different portions of an extended surface.

A direct support for the rubbing-body such as sandpaper, cloth, or the like-is formed by an extended plate R, having the ends of a bow-spring R centrally attached thereto, and the intermediate portion of said spring is held between the two sections Q Q, of the clamp by means of a bolt or like connection R as illustrated in Fig. 4. Thus the said support B may have an oscillatory movement, and the spring allows of a sufficient yield to permit the rubbing-surface to conform to the irregularities of the surface being operated upon and also gives an even pressure under all circumstances. The sandpaper or the like is preferably held in place by clamping-yokes S, Fig. (3, the ends of which are bent at right angles and passed through apertures sin the ends of the plate R and having thumbnuts S applied thereto, whereby the yokes may be drawn up into the recesses T at the ends of the plate and the sandpaper or like material clamped firmly in position. \Vith such an arrangement the renewal of the rubhing-surface is a simple operation, requires but little skill or knowledge on the part of the attendant, and may be accomplished very quickly, whereby any long stoppage for this purpose or for the purpose of changing the character of such materials is avoided.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a rubbing-machine, the combination with a reciprocatory rubber and means for operating the same, of a carriage for supporting the work, parallel tracks on which said carriage is mounted extending at right angles to the line of reciprocation of the rubber, elevating mechanism for said tracks and vertically-adjustable bearings in which said elevating mechanism is supported; substantially as described.

2. In a rubbing-machine the combination with a rubber and means for operating the same, of a carriage for supporting the work movable transversely beneath said rubber, parallel tracks on which said carriage is mounted, pivotal arms carrying said tracks, an operating-shaft for swinging said arms from a more or less horizontal to a more or less vertical position to elevate the track and carriage and vertically-adjustable bearings in which said arms are journaled; substantially as described.

3. In a rubbing-machine the combination with a reciprocatory rubber and. means for operating the same, of a carriage for supporting the work, parallel tracks on which said carriage is mounted extending at right angles to the line of reciprocation of the rubber, an elevating mechanism for said tracks, bearings in which said elevating mechanism is mounted, vertically-arranged screw-shafts supporting said bearings, nuts carried by fixed supports and cooperating with said shafts and gearing connecting said nuts for simultaneous rotation whereby the tracks and carriage are moved upwardly; substantially as described.

4. In a rubbing-machine, the combination with a reciprocatory rubber and means for operating the same, of a carriage for supporting the work, parallel tracks on which said carriage is mounted extending at right angles to the line of reciprocation of the rubber, pivotally-supported arms carrying said tracks, cross-bars having bearings in which said arms are mounted, a shaft for turning the arms to raise or lower the tracks, downwardly-extending screw-shafts supporting the cross-bars and nuts cooperating with said screw-shafts for raising and lowering the cr0ss-bars; substantially as described.

5. In a rubbing-machine the combination with the work-support, main frame and longitudinal guide or way, of a rubber supported on said guide or way, oscillatory shafts at opposite ends of the machine, drums on said shafts, flexible connections between said drums and rubber, a rocker for oscillating the shafts came simultaneously in Opposite directions and having a central recess, a flexible connection connected at opposite ends with drums on said oscillatory shafts and take-up devices located in the recess of the rocker and cooperating with the intermediate portion of the flexible connection for securing the same to the rocker and adjusting its tension; substantially as described.

6. In a rubbing-machine the combination With the Work-support, main frame and longitudinal guide or Way, of a rubber supported on said guide or Way, oscillatory shafts at opposite ends of the machine, drums on said shafts, a single flexible connection uniting said drums and to which the rubber is adjustably attached at an intermediate point and a rocker for oscillating said shafts simultaneously in opposite directions; substantially as described.

7. In a rubbing-machine the combination with the reciprocating rubber, Work-support, oscillatory shafts connected with the rubber for reciprocating the same and driving-tape for said oscillatory shafts, of a rocker having radial arms, tWo segments mounted on said arms and slightly separated at their adjacent ends, adjustable take-ups mounted within said segments near their adjacent ends and cooperating With the tape for adjusting the tension of the same, substantially as do scribed.

8. In a rubbing-machine the combination with a work-support and a guide or support for the rubber, of a rubber having bearings for cooperating with the guide and a support for the rubbing material connected with said rubber by means of an intermediate spring; substantially as described.

9. In a rubbing-machine the combination with the work-support and a guide for the rubber, of the rubber having a body portion provided with bearings for cooperating with the guide, a bow-spring connected with said body portion at an intermediate point and a support for the rubbing-body mounted on said spring; substantially as described.

10. In a rubbing-machine the combination with the Work-support, the guide, the oscillatory shafts and the rubber-driving tape con nected with said shafts, of the rubber having a body provid ed with bearings cooperating with the guide, a clamp cooperating with the tape and a spring-pressed support for the rubbing material; substantially as described.

WILLIAM J. MADDOX.

Witnesses:

FRANK VOUGHT, MARVIN McOLINTooK. 

